- "opto/phasetype.hpp" defines "static const char* phase_names[]" 
- "compiler/compilerEvent.cpp" defines "static GrowableArray<const char*>* phase_names".

This is not a problem when the two files are compiled as different translation units, but it causes a build failure if any of them is pulled in by a precompiled header:

```
/jdk/src/hotspot/share/compiler/compilerEvent.cpp:59:36: error: redefinition of 'phase_names' with a different type: 'GrowableArray<const char *> *' vs 'const char *[100]'
   59 | static GrowableArray<const char*>* phase_names = nullptr;
      |                                    ^
/jdk/src/hotspot/share/opto/phasetype.hpp:147:20: note: previous definition is here
  147 | static const char* phase_names[] = {
      |                    ^
/jdk/src/hotspot/share/compiler/compilerEvent.cpp:67:39: error: member reference base type 'const char *' is not a structure or union
   67 |     const u4 nof_entries = phase_names->length();
      |                            ~~~~~~~~~~~^ ~~~~~~
/jdk/src/hotspot/share/compiler/compilerEvent.cpp:71:31: error: member reference base type 'const char *' is not a structure or union
   71 |       writer.write(phase_names->at(i));
      |                    ~~~~~~~~~~~^ ~~
/jdk/src/hotspot/share/compiler/compilerEvent.cpp:77:34: error: member reference base type 'const char *' is not a structure or union
   77 |   for (int i = 0; i < phase_names->length(); i++) {
      |                       ~~~~~~~~~~~^ ~~~~~~
/jdk/src/hotspot/share/compiler/compilerEvent.cpp:78:35: error: member reference base type 'const char *' is not a structure or union
   78 |     const char* name = phase_names->at(i);
      |                        ~~~~~~~~~~~^ ~~
/jdk/src/hotspot/share/compiler/compilerEvent.cpp:91:9: error: comparison of array 'phase_names' equal to a null pointer is always false [-Werror,-Wtautological-pointer-compare]
   91 |     if (phase_names == nullptr) {
      |         ^~~~~~~~~~~    ~~~~~~~
/jdk/src/hotspot/share/compiler/compilerEvent.cpp:92:19: error: array type 'const char *[100]' is not assignable
   92 |       phase_names = new (mtInternal) GrowableArray<const char*>(100, mtCompiler);
      |       ~~~~~~~~~~~ ^
/jdk/src/hotspot/share/compiler/compilerEvent.cpp:103:24: error: member reference base type 'const char *' is not a structure or union
  103 |     index = phase_names->length();
      |             ~~~~~~~~~~~^ ~~~~~~
/jdk/src/hotspot/share/compiler/compilerEvent.cpp:104:16: error: member reference base type 'const char *' is not a structure or union
  104 |     phase_names->append(use_strdup ? os::strdup(phase_name) : phase_name);
      |     ~~~~~~~~~~~^ ~~~~~~
9 errors generated.
```