Merge pull request #60327 from eltociear/patch-37

[SILGen] Fix typo in SILGenStmt.cpp

Author: swift-ci

lib/SILGen/SILGenStmt.cpp

@@ -126,7 +126,7 @@ void SILGenFunction::eraseBasicBlock(SILBasicBlock *block) {
 void SILGenFunction::mergeCleanupBlocks() {
   for (auto bbPos = F.begin(), bbEnd = F.end(), nextPos = bbPos; bbPos != bbEnd;
        bbPos = nextPos) {
-    // A forward iterator refering to the next unprocessed block in the block
+    // A forward iterator referring to the next unprocessed block in the block
     // list. If blocks are merged and moved, then this will be updated.
     nextPos = std::next(bbPos);