Set --no-print-imm-hex for llvm-objdump invocations

llvm-objdump changed the default behaviour of print-imm-hex, breaking a
number of tests relying on exact output of it. Explicitly set to
--no-print-imm-hex to avoid breakages.

Test: m test-art-host-gtest-art_compiler_host_tests
Bug: 264965700
Change-Id: Icfe165da5818f68080a036f238e479262b919ace
diff --git a/compiler/utils/assembler_test_base.h b/compiler/utils/assembler_test_base.h
index a342d9a..8c18e07 100644
--- a/compiler/utils/assembler_test_base.h
+++ b/compiler/utils/assembler_test_base.h
@@ -154,9 +154,14 @@
   virtual std::vector<std::string> GetDisassemblerCommand() {
     switch (GetIsa()) {
       case InstructionSet::kThumb2:
-        return {FindTool("llvm-objdump"), "--disassemble", "--triple", "thumbv7a-linux-gnueabi"};
+        return {FindTool("llvm-objdump"),
+                "--disassemble",
+                "--no-print-imm-hex",
+                "--triple",
+                "thumbv7a-linux-gnueabi"};
       default:
-        return {FindTool("llvm-objdump"), "--disassemble", "--no-show-raw-insn"};
+        return {
+            FindTool("llvm-objdump"), "--disassemble", "--no-print-imm-hex", "--no-show-raw-insn"};
     }
   }