Revert memory mapped coverage

Bug: http://b/194128476
Bug: http://b/210012154

Reverts:
e6840726bd "[coverage] Override -Wframe-larger-than"
71d697c5cb "Enable memory-mapped coverage instrumentation"

Coverage metrics dropped for ~10 of the 40 modules.  There are also
regressions in mainline when running tests on older platform builds.

Test: presubmit
Change-Id: I4a2b005d3b54764b762b5422e03b7a9ec8727227

rust/coverage.go

@@ -22,7 +22,6 @@ import (
 
 var CovLibraryName = "libprofile-clang-extras"
 
-// Add '%c' to default specifier after we resolve http://b/210012154
 const profileInstrFlag = "-fprofile-instr-generate=/data/misc/trace/clang-%p-%m.profraw"
 
 type coverage struct {
@@ -71,10 +70,6 @@ func (cov *coverage) flags(ctx ModuleContext, flags Flags, deps PathDeps) (Flags
 			"-Wl,-z,nostart-stop-gc",
 		)
 		deps.StaticLibs = append(deps.StaticLibs, coverage.OutputFile().Path())
-		if cc.EnableContinuousCoverage(ctx) {
-			flags.RustFlags = append(flags.RustFlags, "-C llvm-args=--runtime-counter-relocation")
-			flags.LinkFlags = append(flags.LinkFlags, "-Wl,-mllvm,-runtime-counter-relocation")
-		}
 	}
 
 	return flags, deps