Set -fsjlj-exceptions for all 32-bit Windows compiles

Bug: http://b/116784799

Previously this was set only when stl was requested.  We can now pass
this for all C++ compilations.

Test: go/android-llvm-windows-testing
Change-Id: I43e635ff50d0f1a5e000f13021506aeece368b4a

cc/config/x86_windows_host.go

@@ -49,7 +49,11 @@ var (
 
 	windowsClangCppflags = []string{}
 
-	windowsX86ClangCppflags = []string{}
+	windowsX86ClangCppflags = []string{
+		// Use SjLj exceptions for 32-bit.  libgcc_eh implements SjLj
+		// exception model for 32-bit.
+		"-fsjlj-exceptions",
+	}
 
 	windowsX8664ClangCppflags = []string{}
 

cc/stl.go

@@ -239,11 +239,6 @@ func (stl *stl) flags(ctx ModuleContext, flags Flags) Flags {
 			flags.Local.CppFlags = append(flags.Local.CppFlags, "-nostdinc++")
 			flags.extraLibFlags = append(flags.extraLibFlags, "-nostdlib++")
 			if ctx.Windows() {
-				// Use SjLj exceptions for 32-bit.  libgcc_eh implements SjLj
-				// exception model for 32-bit.
-				if ctx.Arch().ArchType == android.X86 {
-					flags.Local.CppFlags = append(flags.Local.CppFlags, "-fsjlj-exceptions")
-				}
 				flags.Local.CppFlags = append(flags.Local.CppFlags,
 					// Disable visiblity annotations since we're using static
 					// libc++.