git: c4cacdd447ba - stable/12 - Apply llvm fix for assertion compiling certain versions of Wine

The branch stable/12 has been updated by dim:

URL: https://cgit.FreeBSD.org/src/commit/?id=c4cacdd447bae53964f439cb94acd9f5cc6a4c14

commit c4cacdd447bae53964f439cb94acd9f5cc6a4c14
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2022-03-19 19:59:04 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2022-03-23 19:57:26 +0000

    Apply llvm fix for assertion compiling certain versions of Wine
    
    Merge commit b9ca73e1a8fd from llvm git (by Stephen Tozer):
    
      [DebugInfo] Correctly handle arrays with 0-width elements in GEP salvaging
    
      Fixes an issue where GEP salvaging did not properly account for GEP
      instructions which stepped over array elements of width 0 (effectively a
      no-op). This unnecessarily produced long expressions by appending
      `... + (x * 0)` and potentially extended the number of SSA values used
      in the dbg.value. This also erroneously triggered an assert in the
      salvage function that the element width would be strictly positive.
      These issues are resolved by simply ignoring these useless operands.
    
      Reviewed By: aprantl
    
      Differential Revision: https://reviews.llvm.org/D111809
    
    PR:             262608
    Reported by:    Damjan Jovanovic <damjan.jov@gmail.com>
    MFC after:      3 days
    
    (cherry picked from commit 1b3bef43e3cb7fb0ab49b813839915514c1134cc)
---
 contrib/llvm-project/llvm/lib/IR/Operator.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/contrib/llvm-project/llvm/lib/IR/Operator.cpp b/contrib/llvm-project/llvm/lib/IR/Operator.cpp
index 18a1c84933e0..f9dbed31c44c 100644
--- a/contrib/llvm-project/llvm/lib/IR/Operator.cpp
+++ b/contrib/llvm-project/llvm/lib/IR/Operator.cpp
@@ -190,12 +190,14 @@ bool GEPOperator::collectOffset(
 
     if (STy || ScalableType)
       return false;
-    // Insert an initial offset of 0 for V iff none exists already, then
-    // increment the offset by IndexedSize.
-    VariableOffsets.insert({V, APInt(BitWidth, 0)});
     APInt IndexedSize =
         APInt(BitWidth, DL.getTypeAllocSize(GTI.getIndexedType()));
-    VariableOffsets[V] += IndexedSize;
+    // Insert an initial offset of 0 for V iff none exists already, then
+    // increment the offset by IndexedSize.
+    if (!IndexedSize.isZero()) {
+      VariableOffsets.insert({V, APInt(BitWidth, 0)});
+      VariableOffsets[V] += IndexedSize;
+    }
   }
   return true;
 }