Fix comment

Author: arsenm

llvm/include/llvm/IR/RuntimeLibcalls.td

@@ -990,7 +990,7 @@ defset list<RuntimeLibcallImpl> LibmF128FiniteLibcalls = {
 defvar AllDefaultLibCalls =
     !foreach(entry, AllDefaultRuntimeLibcallImpls, entry.Provides);
 
-// These libcalls are only available in compiler-rt, not libgcc for
+// These libcalls are only available in libgcc, not compiler-rt for
 // 32-bit arch. They are available on both for 64-bit.
 defvar LibCallsCompilerRT64OrLibGCC = [
    __ashlti3, __lshrti3, __ashrti3, __multi3, __mulodi4