merge revision(s) 39860: [Backport #8150]

	* marshal.c (marshal_dump, marshal_load): workaround for segv on
	  Intel Solaris compiled with Oracle SolarisStudio 12.3.
	  Partly revert r38174. [ruby-core:52042] [Bug #7805]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@40257 b2dd03c8-39d4-4d8f-98ff-823fe69b080e