Remove clang indirection without affecting build.ninja

Remove cflags that are not handled by clang from the global defaults,
and remove calls to ClangFilterUnknownCflags.

Squash lists of clang-specific default flags into the main default
flags lists.

Rename Toolchain.Clang*flags to Toolchain.*flags.

Rename Go variables with Clang in the name that have no non-Clang
equivalent.

Remove unused ninja variables.

Bug: 68947919
Test: no change to build.ninja for aosp_cf_x86_64_phone-userdebug or aosp_crosshatch-userdebug
Change-Id: Id287945315d53e5eaef197adbbb4f1302f2e3680
diff --git a/cc/config/x86_64_device.go b/cc/config/x86_64_device.go
index 54dc6d5..ec8bab2 100644
--- a/cc/config/x86_64_device.go
+++ b/cc/config/x86_64_device.go
@@ -32,8 +32,6 @@
 		"-Wl,--hash-style=gnu",
 	}
 
-	x86_64Lldflags = ClangFilterUnknownLldflags(x86_64Ldflags)
-
 	x86_64ArchVariantCflags = map[string][]string{
 		"": []string{
 			"-march=x86-64",
@@ -102,13 +100,11 @@
 	pctx.StaticVariable("X86_64ToolchainLdflags", "-m64")
 
 	pctx.StaticVariable("X86_64Ldflags", strings.Join(x86_64Ldflags, " "))
-	pctx.StaticVariable("X86_64Lldflags", strings.Join(x86_64Lldflags, " "))
+	pctx.StaticVariable("X86_64Lldflags", strings.Join(x86_64Ldflags, " "))
 
 	// Clang cflags
-	pctx.StaticVariable("X86_64ClangCflags", strings.Join(ClangFilterUnknownCflags(x86_64Cflags), " "))
-	pctx.StaticVariable("X86_64ClangLdflags", strings.Join(ClangFilterUnknownCflags(x86_64Ldflags), " "))
-	pctx.StaticVariable("X86_64ClangLldflags", strings.Join(ClangFilterUnknownCflags(x86_64Lldflags), " "))
-	pctx.StaticVariable("X86_64ClangCppflags", strings.Join(ClangFilterUnknownCflags(x86_64Cppflags), " "))
+	pctx.StaticVariable("X86_64ClangCflags", strings.Join(x86_64Cflags, " "))
+	pctx.StaticVariable("X86_64ClangCppflags", strings.Join(x86_64Cppflags, " "))
 
 	// Yasm flags
 	pctx.StaticVariable("X86_64YasmFlags", "-f elf64 -m amd64")
@@ -118,14 +114,14 @@
 	// Architecture variant cflags
 	for variant, cflags := range x86_64ArchVariantCflags {
 		pctx.StaticVariable("X86_64"+variant+"VariantClangCflags",
-			strings.Join(ClangFilterUnknownCflags(cflags), " "))
+			strings.Join(cflags, " "))
 	}
 }
 
 type toolchainX86_64 struct {
 	toolchainBionic
 	toolchain64Bit
-	toolchainClangCflags string
+	toolchainCflags string
 }
 
 func (t *toolchainX86_64) Name() string {
@@ -152,27 +148,27 @@
 	return t.GccTriple()
 }
 
-func (t *toolchainX86_64) ToolchainClangLdflags() string {
+func (t *toolchainX86_64) ToolchainLdflags() string {
 	return "${config.X86_64ToolchainLdflags}"
 }
 
-func (t *toolchainX86_64) ToolchainClangCflags() string {
-	return t.toolchainClangCflags
+func (t *toolchainX86_64) ToolchainCflags() string {
+	return t.toolchainCflags
 }
 
-func (t *toolchainX86_64) ClangCflags() string {
+func (t *toolchainX86_64) Cflags() string {
 	return "${config.X86_64ClangCflags}"
 }
 
-func (t *toolchainX86_64) ClangCppflags() string {
+func (t *toolchainX86_64) Cppflags() string {
 	return "${config.X86_64ClangCppflags}"
 }
 
-func (t *toolchainX86_64) ClangLdflags() string {
+func (t *toolchainX86_64) Ldflags() string {
 	return "${config.X86_64Ldflags}"
 }
 
-func (t *toolchainX86_64) ClangLldflags() string {
+func (t *toolchainX86_64) Lldflags() string {
 	return "${config.X86_64Lldflags}"
 }
 
@@ -185,17 +181,17 @@
 }
 
 func x86_64ToolchainFactory(arch android.Arch) Toolchain {
-	toolchainClangCflags := []string{
+	toolchainCflags := []string{
 		"${config.X86_64ToolchainCflags}",
 		"${config.X86_64" + arch.ArchVariant + "VariantClangCflags}",
 	}
 
 	for _, feature := range arch.ArchFeatures {
-		toolchainClangCflags = append(toolchainClangCflags, x86_64ArchFeatureCflags[feature]...)
+		toolchainCflags = append(toolchainCflags, x86_64ArchFeatureCflags[feature]...)
 	}
 
 	return &toolchainX86_64{
-		toolchainClangCflags: strings.Join(toolchainClangCflags, " "),
+		toolchainCflags: strings.Join(toolchainCflags, " "),
 	}
 }