[Committed] Handle COPYSIGN in dwarf2out.cc'd mem_loc_descriptor

[Committed] Handle COPYSIGN in dwarf2out.cc'd mem_loc_descriptor

[Roger Sayle]

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Many thanks to Hans-Peter Nilsson for reminding me that new RTX codes
need to be added to dwarf2out.cc's mem_loc_descriptor, and for doing
this for BITREVERSE.  This patch does the same for the recently added
COPYSIGN.  I'd been testing these on a target that doesn't use DWARF
(nvptx-none) and so didn't exhibit the issue, and my additional testing
on x86_64-pc-linux-gnu to double check that changes were safe, doesn't
(yet) trigger the problematic assert in dwarf2out.cc's mem_loc_descriptor.

Committed to mainline as obvious, after bootstrapping and regression
testing on x86_64-pc-linux-gnu.


2023-07-06  Roger Sayle  <roger@nextmovesoftware.com>

gcc/ChangeLog
        * dwarf2out.cc (mem_loc_descriptor): Handle COPYSIGN.


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diff --git a/gcc/dwarf2out.cc b/gcc/dwarf2out.cc
index e973644..238d0a9 100644
--- a/gcc/dwarf2out.cc
+++ b/gcc/dwarf2out.cc
@@ -16941,6 +16941,7 @@ mem_loc_descriptor (rtx rtl, machine_mode mode,
     case SMUL_HIGHPART:
     case UMUL_HIGHPART:
     case BITREVERSE:
+    case COPYSIGN:
       break;
 
     case CONST_STRING: