Converted test to assembly for '%cflags' compatibility.

The '-static' option does not work well with '-nostartfiles -nostdlib'
that comes with '%cflags', but the latter is needed for better buildbot
compatibility.

I converted the test to assembly and dropped the previous c test.

Dropped dummy-return.test and main.c Input file.

Author: paschalis-mpeis

bolt/test/AArch64/dummy-return.s

@@ -2,10 +2,14 @@
 
 # RUN: llvm-mc -filetype=obj -triple aarch64-unknown-unknown %s -o %t.o
 # RUN: %clang %cflags %t.o -o %t.exe -Wl,-q -static
-# RUN: not --crash llvm-bolt -instrument -instrumentation-sleep-time=1 %t.exe \
+# RUN: llvm-bolt -instrument -instrumentation-sleep-time=1 %t.exe \
 # RUN:  -o %t.instr 2>&1 | FileCheck %s
+# RUN: llvm-objdump --disassemble-symbols=__bolt_fini_trampoline %t.instr -D \
+# RUN:  | FileCheck %s -check-prefix=CHECK-ASM
 
-# CHECK: not implemented
+# CHECK: BOLT-INFO: output linked against instrumentation runtime library
+# CHECK-ASM: <__bolt_fini_trampoline>:
+# CHECK-ASM-NEXT: ret
 
   .text
   .align 4