[llvm] [Coalescer] Consider NewMI's subreg index when updating lanemask. (PR #121780)

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git-clang-format --diff a5e129ccdedf5c269a8e0fcad5e21381a7f0342c 912ab029cc730580b50d79db89a32bd26d2ecb2a --extensions cpp -- llvm/lib/CodeGen/RegisterCoalescer.cpp
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View the diff from clang-format here.
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diff --git a/llvm/lib/CodeGen/RegisterCoalescer.cpp b/llvm/lib/CodeGen/RegisterCoalescer.cpp
index 110f13ac65..e2a1b8852f 100644
--- a/llvm/lib/CodeGen/RegisterCoalescer.cpp
+++ b/llvm/lib/CodeGen/RegisterCoalescer.cpp
@@ -1527,8 +1527,9 @@ bool RegisterCoalescer::reMaterializeTrivialDef(const CoalescerPair &CP,
     // In a situation like the following:
     //
     //    undef %2.subreg:reg = INST %1:reg         ; DefMI (rematerializable),
-    //                                              ; Defines only some of lanes,
-    //                                              ; so DefSubIdx = NewIdx = subreg
+    //                                              ; Defines only some of
+    //                                              lanes, ; so DefSubIdx =
+    //                                              NewIdx = subreg
     //    %3:reg = COPY %2                          ; Copy full reg
     //    .... = SOMEINSTR %3:reg                   ; Use full reg
     //

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https://github.com/llvm/llvm-project/pull/121780