MIPS: Check that branches to trampoline pool do actually reach.

Do the check in release mode, too. Prefer crash over mis-patched
branch instruction.

BUG=v8:4294
LOG=N

Review URL: https://codereview.chromium.org/1233623004

Cr-Commit-Position: refs/heads/master@{#29581}

src/mips/assembler-mips.cc

@@ -795,7 +795,7 @@ void Assembler::bind_to(Label* L, int pos) {
           trampoline_pos = get_trampoline_entry(fixup_pos);
           CHECK(trampoline_pos != kInvalidSlotPos);
         }
-        DCHECK((trampoline_pos - fixup_pos) <= kMaxBranchOffset);
+        CHECK((trampoline_pos - fixup_pos) <= kMaxBranchOffset);
         target_at_put(fixup_pos, trampoline_pos, false);
         fixup_pos = trampoline_pos;
         dist = pos - fixup_pos;

src/mips64/assembler-mips64.cc

@@ -801,7 +801,7 @@ void Assembler::bind_to(Label* L, int pos) {
           trampoline_pos = get_trampoline_entry(fixup_pos);
           CHECK(trampoline_pos != kInvalidSlotPos);
         }
-        DCHECK((trampoline_pos - fixup_pos) <= kMaxBranchOffset);
+        CHECK((trampoline_pos - fixup_pos) <= kMaxBranchOffset);
         target_at_put(fixup_pos, trampoline_pos, false);
         fixup_pos = trampoline_pos;
         dist = pos - fixup_pos;