[llvm] [GlobalISel] Change MatchTable entries to 1 byte each (PR #74429)

[Wang Pengcheng via llvm-commits]

================
@@ -111,6 +148,17 @@ template std::vector<Matcher *> optimizeRules<SwitchMatcher>(
     ArrayRef<Matcher *> Rules,
     std::vector<std::unique_ptr<Matcher>> &MatcherStorage);
 
+static std::string getEncodedEmitStr(StringRef NamedValue, unsigned NumBytes) {
+  if (NumBytes == 2)
----------------
wangpc-pp wrote:

This can be simplified to:
```c
static std::string getEncodedEmitStr(StringRef NamedValue, unsigned NumBytes) {
  if (NumBytes == 2 || NumBytes == 4 || NumBytes == 8)
    return ("GIMT_Encode" + NumBytes + "(" + NamedValue + ")").str();
  else
    llvm_unreachable("Unsupported number of bytes!");
}
```

https://github.com/llvm/llvm-project/pull/74429