[heap] Remove max executable size configuration.

src/mips/assembler-mips.h

Index: src/mips/assembler-mips.h
diff --git a/src/mips/assembler-mips.h b/src/mips/assembler-mips.h
index e4b60c1d244676488a9b8bc11e759de3595e2e4e..7df318b9ab7c1c7d21f9c7cc082148a6390bb91b 100644
--- a/src/mips/assembler-mips.h
+++ b/src/mips/assembler-mips.h
@@ -1927,6 +1927,9 @@ class Assembler : public AssemblerBase {
   inline void CheckBuffer();
 
  private:
+  // Avoid overflows for displacements etc.
+  static const int kMaximalBufferSize = 512 * MB;
+
   inline static void set_target_internal_reference_encoded_at(Address pc,
                                                               Address target);