[heap] Remove max executable size configuration.

src/mips64/assembler-mips64.h

Index: src/mips64/assembler-mips64.h
diff --git a/src/mips64/assembler-mips64.h b/src/mips64/assembler-mips64.h
index 74a3204c2c8930b8647cae95913f08c24f71df5d..3c0e834c3743a74bb7f4f5dc529f464943497f2b 100644
--- a/src/mips64/assembler-mips64.h
+++ b/src/mips64/assembler-mips64.h
@@ -1976,6 +1976,9 @@ class Assembler : public AssemblerBase {
   inline void CheckTrampolinePoolQuick(int extra_instructions = 0);
 
  private:
+  // Avoid overflows for displacements etc.
+  static const int kMaximalBufferSize = 512 * MB;
+
   // Buffer size and constant pool distance are checked together at regular
   // intervals of kBufferCheckInterval emitted bytes.
   static constexpr int kBufferCheckInterval = 1 * KB / 2;