[arm] Clean up the use of UNALIGNED_ACCESSES.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 50ed471db6f3c5a8a4ff5a8b00856a58f0c917e2..e8c6d096448f975aa39ac109eeed5353059f73e0 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -558,8 +558,6 @@ DEFINE_BOOL(enable_sudiv, true,
 DEFINE_BOOL(enable_movw_movt, false,
             "enable loading 32-bit constant by means of movw/movt "
             "instruction pairs (ARM only)")
-DEFINE_BOOL(enable_unaligned_accesses, true,
-            "enable unaligned accesses for ARMv7 (ARM only)")
 DEFINE_BOOL(enable_32dregs, ENABLE_32DREGS_DEFAULT,
             "enable use of d16-d31 registers on ARM - this requires VFP3")
 DEFINE_BOOL(enable_vldr_imm, false,
@@ -568,6 +566,10 @@ DEFINE_BOOL(force_long_branches, false,
             "force all emitted branches to be in long mode (MIPS/PPC only)")
 DEFINE_STRING(mcpu, "auto", "enable optimization for specific cpu")
 
+// regexp-macro-assembler-*.cc
+DEFINE_BOOL(enable_regexp_unaligned_accesses, true,
+            "enable unaligned accesses for the regexp engine")
+
 DEFINE_IMPLICATION(enable_armv8, enable_vfp3)
 DEFINE_IMPLICATION(enable_armv8, enable_neon)
 DEFINE_IMPLICATION(enable_armv8, enable_32dregs)