[llvm] [GlobalISel] Add constant matcher for APInt (PR #151357)

[Matt Arsenault via llvm-commits]

================
@@ -192,63 +192,92 @@ m_GFCstOrSplat(std::optional<FPValueAndVReg> &FPValReg) {
 
 /// Matcher for a specific constant value.
 struct SpecificConstantMatch {
-  int64_t RequestedVal;
-  SpecificConstantMatch(int64_t RequestedVal) : RequestedVal(RequestedVal) {}
+  APInt RequestedVal;
+  SpecificConstantMatch(APInt RequestedVal) : RequestedVal(RequestedVal) {}
----------------
arsenm wrote:

const ref 

https://github.com/llvm/llvm-project/pull/151357