RFR: 8149591 - Prepare hotspot for GTest

[Jesper Wilhelmsson]

Hi,

Please review this change to prepare the Hotspot code for the Google unit test 
framework. From the RFE:

A few changes are needed in the hotspot code to start using the Google Test 
framework.

1. The new() operator as defined in allocation.cpp can not be used together with 
GTest. This needs to be moved to a separate file so that we can avoid compiling 
it when building the GTest enabled JVM.

2. In management.cpp there is a local variable called err_msg. This variable is 
shadowing a global variable in debug.hpp. In the GTest work the global err_msg 
variable is used in the vmassert macro and this creates a conflict with the 
local variable in management.cpp.

3. If SuppressFatalErrorMessage is set ALL error messages should be suppressed, 
even the ones in error_is_suppressed() in debug.cpp.

This is what is done by this change.

RFE: https://bugs.openjdk.java.net/browse/JDK-8149591
Webrev: http://cr.openjdk.java.net/~jwilhelm/8149591/webrev.00/index.html

Thanks,
/Jesper