diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -1413,8 +1413,6 @@
     if (auto *AI =
             dyn_cast_or_null<AllocaInst>(DII->getVariableLocationOp(0))) {
       if (Optional<TypeSize> FragmentSize = AI->getAllocationSizeInBits(DL)) {
-        assert(ValueSize.isScalable() == FragmentSize->isScalable() &&
-               "Both sizes should agree on the scalable flag.");
         return TypeSize::isKnownGE(ValueSize, *FragmentSize);
       }
     }
diff --git a/llvm/test/Transforms/InstCombine/debuginfo-scalable-typesize.ll b/llvm/test/Transforms/InstCombine/debuginfo-scalable-typesize.ll
--- a/llvm/test/Transforms/InstCombine/debuginfo-scalable-typesize.ll
+++ b/llvm/test/Transforms/InstCombine/debuginfo-scalable-typesize.ll
@@ -16,9 +16,18 @@
 
 declare <vscale x 2 x double> @f(<vscale x 2 x double>*)
 
+define float @debug_scalablevec_bitcast_to_scalar() {
+  %v.addr = alloca <vscale x 4 x float>, align 16
+  call void @llvm.dbg.declare(metadata <vscale x 4 x float>* %v.addr, metadata !3, metadata !DIExpression()), !dbg !5
+  %a = bitcast <vscale x 4 x float>* %v.addr to float*
+  %b = load float, float* %a, align 16
+  ret float %b
+}
+
 declare void @llvm.dbg.declare(metadata, metadata, metadata)
 
 !llvm.module.flags = !{!2}
+!llvm.dbg.cu = !{!0}
 
 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1)
 !1 = !DIFile(filename: "/tmp/test.c", directory: "/tmp/")