[llvm] [DirectX] Fix build break caused by bitcode writer changes (PR #133770)

[Farzon Lotfi via llvm-commits]

https://github.com/farzonl created https://github.com/llvm/llvm-project/pull/133770

commit: https://github.com/llvm/llvm-project/commit/68947342b75cc71f3ac9041d11db086d8d074336 added a new `writeDIFixedPointType` function.
 However, `DIFixedPointType` is not supported in DXIL so we need to add a fail fast case for this to fix the build.

this change fixes a build break introduced by https://github.com/llvm/llvm-project/pull/129596

>From 3ac2cff442d7a4643621fcbc32ec9dc24931669d Mon Sep 17 00:00:00 2001
From: Farzon Lotfi <farzonlotfi at microsoft.com>
Date: Mon, 31 Mar 2025 14:04:41 -0400
Subject: [PATCH] [DirectX] Fix build break caused by bitcode writer changes

commit: https://github.com/llvm/llvm-project/commit/68947342b75cc71f3ac9041d11db086d8d074336
added a new `writeDIFixedPointType` function. However DIFixedPointType
is not supported in DXIL so we need to add a fail fast case for this to
fix the build.

this change fixes a build break introduced by https://github.com/llvm/llvm-project/pull/129596
---
 llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp b/llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp
index ea33ee5759cb7..2a736c91c05c7 100644
--- a/llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp
+++ b/llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp
@@ -237,6 +237,11 @@ class DXILBitcodeWriter {
                          SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
   void writeDIBasicType(const DIBasicType *N, SmallVectorImpl<uint64_t> &Record,
                         unsigned Abbrev);
+  void writeDIFixedPointType(const DIFixedPointType *N,
+                             SmallVectorImpl<uint64_t> &Record,
+                             unsigned Abbrev) {
+    llvm_unreachable("DXIL cannot contain DIFixedPointType Nodes");
+  }
   void writeDIStringType(const DIStringType *N,
                          SmallVectorImpl<uint64_t> &Record, unsigned Abbrev) {
     llvm_unreachable("DXIL cannot contain DIStringType Nodes");