[BOLT][TEST] Imported small tests

Summary:
Imported small internal tests:
- R_X86_64_64.pic.lld.cpp
- avx512_trap.test
- bad_exe.test
- bolt_info.test

(cherry picked from FBD31251439)

bolt/test/X86/Inputs/avx512.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+void use_avx512() {
+  printf("after first entry\n");
+  asm (".byte 0x62, 0xe2, 0xf5, 0x70, 0x2c, 0xda");
+  asm ("secondary_entry:");
+  printf("after secondary entry\n");
+}
+
+int main() {
+  printf("about to use avx-512 instruction...\n");
+  use_avx512();
+
+  return 0;
+}

bolt/test/X86/Inputs/switch_statement.cpp

@@ -0,0 +1,29 @@
+#include <stdio.h>
+
+int inc(int x) {
+  switch (x) {
+    case 0: puts("0"); return 1;
+    case 1: puts("1"); return 2;
+    case 2: puts("2"); return 3;
+    case 3: puts("3"); return 4;
+    case 4: puts("4"); return 5;
+    case 5: puts("5"); return 6;
+    default: return x + 1;
+  }
+}
+
+int inc_dup(int x) {
+  switch (x) {
+    case 0: puts("0"); return 1;
+    case 1: puts("1"); return 2;
+    case 2: puts("2"); return 3;
+    case 3: puts("3"); return 4;
+    case 4: puts("4"); return 5;
+    case 5: puts("5"); return 6;
+    default: return x + 1;
+  }
+}
+
+int main() {
+  return inc(5) - 2*inc_dup(2);
+}

bolt/test/X86/R_X86_64_64.pic.lld.cpp

@@ -0,0 +1,15 @@
+/*
+ * Check that we don't assert on a duplicate static relocation added by lld
+ * against _Z6myfuncv. The same address has a dynamic relocation against it.
+ *
+ * RUN: %clang -fPIC -shared %s -o %t.so -Wl,-q -fuse-ld=ld.lld
+ * RUN: llvm-bolt %t.so -o %t.so.bolt -relocs
+ */
+
+unsigned long long myfunc();
+
+unsigned long long (*myglobal)() = myfunc;
+
+unsigned long long myfunc() {
+  return reinterpret_cast<unsigned long long>(myglobal);
+}

bolt/test/X86/avx512_trap.test

@@ -0,0 +1,19 @@
+# Check that BOLT inserts trap instruction at entry to functions that use AVX-512.
+# Check that AVX-512 instruction is updated correctly when -trap-avx512=0 is passed.
+
+RUN: %clang %S/Inputs/avx512.c -o %t -Wl,-q,-znow
+RUN: llvm-bolt %t -trap-avx512=1 -o %t.bolt 2>&1 | FileCheck %s && \
+RUN:    llvm-objdump -d --disassemble-symbols=use_avx512 %t.bolt | FileCheck %s --check-prefix=CHECK-DIS
+RUN: llvm-bolt %t -trap-avx512=0 -o %t.bolt && \
+RUN:    llvm-objdump -d --disassemble-symbols=use_avx512 %t.bolt | FileCheck %s --check-prefix=CHECK-DIS-NO-TRAP
+
+CHECK: BOLT-WARNING: 1 function will trap on entry
+
+# Check that we have two ud2 instructions - one per entry.
+CHECK-DIS:      use_avx512
+CHECK-DIS-NEXT:    ud2
+CHECK-DIS-NEXT:    ud2
+
+# Check that we generate correct AVX-512
+CHECK-DIS-NO-TRAP:      use_avx512
+CHECK-DIS-NO-TRAP:          62 e2 f5 70 2c da    	vscalefpd 

bolt/test/X86/bad_exe.test

@@ -0,0 +1,7 @@
+# Check that llvm-bolt rejects input that is not a valid ELF executable
+# bzip2.debuginfo is the result of running "objcopy --only-keep-debug".
+RUN: %clang %S/Inputs/switch_statement.cpp -g -o %t
+RUN: llvm-objcopy --only-keep-debug %t %t.debuginfo
+RUN: not llvm-bolt %t.debuginfo -o /dev/null |& FileCheck %s
+
+CHECK: input binary is not a valid ELF executable

bolt/test/X86/bolt_info.test

@@ -0,0 +1,7 @@
+# Check that the .bolt_info section is generated properly.
+RUN: %clang %S/Inputs/switch_statement.cpp -o %t
+RUN: llvm-bolt %t -o %t.bolt && \
+RUN: llvm-objdump -s -j .note.bolt_info %t.bolt | grep -v "file format" | \
+RUN:   cut -c 44- | tr -d '\n' | FileCheck %s
+
+CHECK: BOLT revision: {{.*}}, command line: {{.*}}llvm-bolt {{.*}}/bolt_info.test.tmp -o {{.*}}/bolt_info.test.tmp.bolt