[clang] [clang] Introduce "binary" StringLiteral for #embed data (PR #127629)

[Mariya Podchishchaeva via cfe-commits]

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@@ -1332,6 +1334,11 @@ StringLiteral::getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
                                  const LangOptions &Features,
                                  const TargetInfo &Target, unsigned *StartToken,
                                  unsigned *StartTokenByteOffset) const {
+  // No source location of bytes for binary literals since they don't come from
+  // source.
+  if (getKind() == StringLiteralKind::Binary)
+    return getStrTokenLoc(0);
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Fznamznon wrote:

It will point at the beginning of the StringLiteral, but not to a particular problematic byte (which this function intends to find). In case of `#embed` it will point to the directive location. The test I'm adding should exercise that.

https://github.com/llvm/llvm-project/pull/127629