x86_64: Add UD2 instruction and test.
This instruction is useful to guard unreachable code that we have to
generate for some rason, but we should never execute.
Bug: 71781600
Test: $ANDROID_HOST_OUT/nativetest64/art_compiler_host_tests/art_compiler_host_tests --gtest_filter='*AssemblerX86_64Test.Ud2*'
Change-Id: Ibd106c0091bd3fd958ab34f0b6d90382773aad79
diff --git a/compiler/utils/x86_64/assembler_x86_64.h b/compiler/utils/x86_64/assembler_x86_64.h
index 2cbc9d9..7d61500 100644
--- a/compiler/utils/x86_64/assembler_x86_64.h
+++ b/compiler/utils/x86_64/assembler_x86_64.h
@@ -982,6 +982,8 @@
void repe_cmpsq();
void rep_movsw();
+ void ud2();
+
//
// Macros for High-level operations.
//