[llvm][NFC] Update URL in comment about Android ABI

The previous URL was stale, and referenced 'master' instead of 'main',
which will never be updated.

Reviewers: topperc, enh-google

Reviewed By: enh-google

Pull Request: #87726

Author: ilovepi

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

@@ -26025,7 +26025,7 @@ static Value *UseTlsOffset(IRBuilderBase &IRB, unsigned Offset) {
 Value *AArch64TargetLowering::getIRStackGuard(IRBuilderBase &IRB) const {
   // Android provides a fixed TLS slot for the stack cookie. See the definition
   // of TLS_SLOT_STACK_GUARD in
-  // https://android.googlesource.com/platform/bionic/+/master/libc/private/bionic_tls.h
+  // https://android.googlesource.com/platform/bionic/+/main/libc/platform/bionic/tls_defines.h
   if (Subtarget->isTargetAndroid())
     return UseTlsOffset(IRB, 0x28);