AArch64AsmBackend: Remove redundant PCRelFlagVal

This flag, copied from Thumb, is not needed. adjustFixupValue reports
"fixup not sufficiently aligned" when the fixup value is misaligned.

Author: MaskRay

llvm/lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp

@@ -30,9 +30,6 @@ using namespace llvm;
 namespace {
 
 class AArch64AsmBackend : public MCAsmBackend {
-  static const unsigned PCRelFlagVal =
-      MCFixupKindInfo::FKF_IsAlignedDownTo32Bits;
-
 protected:
   Triple TheTriple;
 
@@ -51,22 +48,22 @@ class AArch64AsmBackend : public MCAsmBackend {
         // in AArch64FixupKinds.h.
         //
         // Name                           Offset (bits) Size (bits)     Flags
-        {"fixup_aarch64_pcrel_adr_imm21", 0, 32, PCRelFlagVal},
-        {"fixup_aarch64_pcrel_adrp_imm21", 0, 32, PCRelFlagVal},
+        {"fixup_aarch64_pcrel_adr_imm21", 0, 32, 0},
+        {"fixup_aarch64_pcrel_adrp_imm21", 0, 32, 0},
         {"fixup_aarch64_add_imm12", 10, 12, 0},
         {"fixup_aarch64_ldst_imm12_scale1", 10, 12, 0},
         {"fixup_aarch64_ldst_imm12_scale2", 10, 12, 0},
         {"fixup_aarch64_ldst_imm12_scale4", 10, 12, 0},
         {"fixup_aarch64_ldst_imm12_scale8", 10, 12, 0},
         {"fixup_aarch64_ldst_imm12_scale16", 10, 12, 0},
-        {"fixup_aarch64_ldr_pcrel_imm19", 5, 19, PCRelFlagVal},
+        {"fixup_aarch64_ldr_pcrel_imm19", 5, 19, 0},
         {"fixup_aarch64_movw", 5, 16, 0},
-        {"fixup_aarch64_pcrel_branch9", 5, 9,  PCRelFlagVal},
-        {"fixup_aarch64_pcrel_branch14", 5, 14, PCRelFlagVal},
-        {"fixup_aarch64_pcrel_branch16", 5, 16, PCRelFlagVal},
-        {"fixup_aarch64_pcrel_branch19", 5, 19, PCRelFlagVal},
-        {"fixup_aarch64_pcrel_branch26", 0, 26, PCRelFlagVal},
-        {"fixup_aarch64_pcrel_call26", 0, 26, PCRelFlagVal}};
+        {"fixup_aarch64_pcrel_branch9", 5, 9, 0},
+        {"fixup_aarch64_pcrel_branch14", 5, 14, 0},
+        {"fixup_aarch64_pcrel_branch16", 5, 16, 0},
+        {"fixup_aarch64_pcrel_branch19", 5, 19, 0},
+        {"fixup_aarch64_pcrel_branch26", 0, 26, 0},
+        {"fixup_aarch64_pcrel_call26", 0, 26, 0}};
 
     // Fixup kinds from raw relocation types and .reloc directives force
     // relocations and do not need these fields.