[coverage] Override -Wframe-larger-than

Bug: http://b/214221000
Bug: http://b/194128476

Adding `-mllvm -runtime-counter-relocation` for continuous coverage has
caused -Wframe-larger-than warnings when linking libart.  These warnings
need not be enforced on coverage builds, so override the flag.

Test: NATIVE_COVERAGE_PATHS=art CLANG_COVERAGE=true m libart;
      also go/abtd on failing target.
Change-Id: I8f5ac725ff5c674e6dd0831136d3d8b2e42b0428

cc/coverage.go

@@ -104,6 +104,8 @@ func (cov *coverage) flags(ctx ModuleContext, flags Flags, deps PathDeps) (Flags
 		} else if clangCoverage {
 			flags.Local.CommonFlags = append(flags.Local.CommonFlags, profileInstrFlag,
 				"-fcoverage-mapping", "-Wno-pass-failed", "-D__ANDROID_CLANG_COVERAGE__")
+			// Override -Wframe-larger-than that a module may use.
+			flags.Local.CFlags = append(flags.Local.CFlags, "-Wno-frame-larger-than=")
 			if EnableContinuousCoverage(ctx) {
 				flags.Local.CommonFlags = append(flags.Local.CommonFlags, "-mllvm", "-runtime-counter-relocation")
 			}