Remove gcc-specific optimizations

These flags were added for gcc, but are always stripped out when
compiling for clang.  Since gcc is barely used, removed them.

Bug: 68855788
Bug: 68947919
Test: m checkbuild
Change-Id: Iae2bda9808dd9499848ce145ccdf71c4c490b80e
diff --git a/cc/config/x86_device.go b/cc/config/x86_device.go
index 8fd65f7..b9ce4af 100644
--- a/cc/config/x86_device.go
+++ b/cc/config/x86_device.go
@@ -21,11 +21,7 @@
 )
 
 var (
-	x86Cflags = []string{
-		"-finline-functions",
-		"-finline-limit=300",
-		"-funswitch-loops",
-	}
+	x86Cflags = []string{}
 
 	x86ClangCflags = append(x86Cflags, []string{
 		"-msse3",