Disable FMA by default. Use -Ofma or jit.opt.start("+fma") to enable. #39

Job	Run time
LuaJIT with Valgrind (Linux/x86_64) Debug CC: gcc GC64:ON SYSMALLOC:ON leak-check: full	6m 2s
LuaJIT with Valgrind (Linux/x86_64) Debug CC: gcc GC64:ON SYSMALLOC:ON leak-check: full	9m 4s
LuaJIT with Valgrind (Linux/x86_64) Debug CC: gcc GC64:ON SYSMALLOC:ON malloc/free-fill: 0x00	3m 51s
LuaJIT with Valgrind (Linux/x86_64) Debug CC: gcc GC64:ON SYSMALLOC:ON malloc/free-fill: 0x00	3m 51s
LuaJIT with Valgrind (Linux/x86_64) Debug CC: gcc GC64:ON SYSMALLOC:ON malloc/free-fill: 0xff	2m 57s
LuaJIT with Valgrind (Linux/x86_64) Debug CC: gcc GC64:ON SYSMALLOC:ON malloc/free-fill: 0xff	2m 57s
LuaJIT with Valgrind (Linux/x86_64) Release CC: gcc GC64:ON SYSMALLOC:ON leak-check: full	7m 48s
LuaJIT with Valgrind (Linux/x86_64) Release CC: gcc GC64:ON SYSMALLOC:ON leak-check: full	7m 48s
LuaJIT with Valgrind (Linux/x86_64) Release CC: gcc GC64:ON SYSMALLOC:ON malloc/free-fill: 0x00	2m 4s
LuaJIT with Valgrind (Linux/x86_64) Release CC: gcc GC64:ON SYSMALLOC:ON malloc/free-fill: 0x00	2m 4s
LuaJIT with Valgrind (Linux/x86_64) Release CC: gcc GC64:ON SYSMALLOC:ON malloc/free-fill: 0xff	2m 20s
LuaJIT with Valgrind (Linux/x86_64) Release CC: gcc GC64:ON SYSMALLOC:ON malloc/free-fill: 0xff	2m 20s
	53m 6s

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