[BOLT][TEST] Imported small tests

Summary:
Imported small internal tests:
- cfi_instrs_reordered.s
- no_entry_reordering.test
- no_relocs.test
- pie.test

(cherry picked from FBD31514823)

bolt/test/X86/Inputs/entry.s

@@ -0,0 +1,51 @@
+  .globl _start
+  .type _start, %function
+_start:
+# FDATA: 0 [unknown] 0 1 _start 0 0 792
+	.cfi_startproc
+LBB00:
+	movl	$0x0, %eax
+  jmp	Ltmp0
+
+LFT0:
+	cmpl	$0x0, %eax
+  jmp	Ltmp1
+
+Ltmp1:
+  jmp	LBB00
+# FDATA: 1 _start #Ltmp1# 1 _start #LBB00# 13 792
+
+Ltmp0:
+  jmp	Ltmp2
+
+Ltmp2:
+  jmp	Ltmp3
+
+Ltmp3:
+  jmp	Ltmp4
+
+Ltmp4:
+  jmp	Ltmp5
+
+Ltmp5:
+  jmp	Ltmp6
+
+Ltmp6:
+  jmp	Ltmp7
+
+Ltmp7:
+  jmp	Ltmp8
+
+Ltmp8:
+  jmp	Ltmp9
+
+Ltmp9:
+  jmp	Ltmp10
+
+Ltmp10:
+  jmp	Ltmp11
+
+Ltmp11:
+	retq
+	.cfi_endproc
+.size _start, .-_start

bolt/test/X86/Inputs/jump_table_icp.cpp

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int total = 0;
+
+int inc(int x) {
+  switch (x) {
+    case 0: total += 1 + 0; return 1;
+    case 1: total += 1 + 1; return 2;
+    case 2: total += 1 + 2; return 3;
+    case 3: total += 1 + 3; return 4;
+    case 4: total += 1 + 4; return 5;
+    case 5: total += 1 + 5; return 6;
+    default: return x + 1;
+  }
+}
+
+int inc_dup(int x) {
+  switch (x) {
+    case 0: total += 2 + 0; return 1;
+    case 1: total += 2 + 1; return 2;
+    case 2: total += 2 + 2; return 3;
+    case 3: total += 2 + 3; return 4;
+    case 4: total += 2 + 4; return 5;
+    case 5: total += 2 + 5; return 6;
+    default: return x + 1;
+  }
+}
+
+int main() {
+  int c = 0;
+  for (int i = 0; i < 10000000; ++i) {
+    int a = rand() % 7;
+    int b = rand() % 7;
+    c += inc(a) - 2*inc_dup(b);
+  }
+  return c == 0;
+}