Use empty string for core image variant

Use the empty string for the core image variant so that modules
added to imageMutator do not change their build directory.

Bug: 142286466
Test: m checkbuild
Change-Id: Ida4534d9a4d6176236aaa480fed359ce27acfaa1
Merged-In: Ida4534d9a4d6176236aaa480fed359ce27acfaa1
(cherry picked from commit 72d685ee7f45e5393be44ae4159edf083ac918de)
diff --git a/cc/library_test.go b/cc/library_test.go
index f8d8934..b8d8895 100644
--- a/cc/library_test.go
+++ b/cc/library_test.go
@@ -27,8 +27,8 @@
 			srcs: ["foo.c", "baz.o"],
 		}`)
 
-		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("ld")
-		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_static").Output("libfoo.a")
+		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_shared").Rule("ld")
+		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_static").Output("libfoo.a")
 
 		if len(libfooShared.Inputs) != 2 {
 			t.Fatalf("unexpected inputs to libfoo shared: %#v", libfooShared.Inputs.Strings())
@@ -56,8 +56,8 @@
 			},
 		}`)
 
-		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("ld")
-		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_static").Output("libfoo.a")
+		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_shared").Rule("ld")
+		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_static").Output("libfoo.a")
 
 		if len(libfooShared.Inputs) != 1 {
 			t.Fatalf("unexpected inputs to libfoo shared: %#v", libfooShared.Inputs.Strings())
@@ -82,8 +82,8 @@
 			},
 		}`)
 
-		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("ld")
-		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_static").Output("libfoo.a")
+		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_shared").Rule("ld")
+		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_static").Output("libfoo.a")
 
 		if len(libfooShared.Inputs) != 2 {
 			t.Fatalf("unexpected inputs to libfoo shared: %#v", libfooShared.Inputs.Strings())
@@ -108,8 +108,8 @@
 			},
 		}`)
 
-		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("ld")
-		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_static").Output("libfoo.a")
+		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_shared").Rule("ld")
+		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_static").Output("libfoo.a")
 
 		if len(libfooShared.Inputs) != 1 {
 			t.Fatalf("unexpected inputs to libfoo shared: %#v", libfooShared.Inputs.Strings())
@@ -134,8 +134,8 @@
 			},
 		}`)
 
-		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("ld")
-		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_static").Output("libfoo.a")
+		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_shared").Rule("ld")
+		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_static").Output("libfoo.a")
 
 		if len(libfooShared.Inputs) != 1 {
 			t.Fatalf("unexpected inputs to libfoo shared: %#v", libfooShared.Inputs.Strings())
@@ -165,8 +165,8 @@
 			},
 		}`)
 
-		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("ld")
-		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_static").Output("libfoo.a")
+		libfooShared := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_shared").Rule("ld")
+		libfooStatic := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_static").Output("libfoo.a")
 
 		if len(libfooShared.Inputs) != 3 {
 			t.Fatalf("unexpected inputs to libfoo shared: %#v", libfooShared.Inputs.Strings())
@@ -180,7 +180,7 @@
 			t.Errorf("static objects not reused for shared library")
 		}
 
-		libfoo := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Module().(*Module)
+		libfoo := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_shared").Module().(*Module)
 		if !inList("-DGOOGLE_PROTOBUF_NO_RTTI", libfoo.flags.Local.CFlags) {
 			t.Errorf("missing protobuf cflags")
 		}