[hexagon] Turning off sign mismatch warning by default.

Patch-by: Colin Lemahieu <[email protected]>

Differential Revision: https://reviews.llvm.org/D143531

Author: androm3da

llvm/lib/Target/Hexagon/AsmParser/HexagonAsmParser.cpp

@@ -71,7 +71,7 @@ static cl::opt<bool> ErrorMissingParenthesis(
 static cl::opt<bool> WarnSignedMismatch(
     "mwarn-sign-mismatch",
     cl::desc("Warn for mismatching a signed and unsigned value"),
-    cl::init(true));
+    cl::init(false));
 static cl::opt<bool> WarnNoncontigiousRegister(
     "mwarn-noncontigious-register",
     cl::desc("Warn for register names that arent contigious"), cl::init(true));