Add support for compiling with the Fil-C Memory Safe C toolchain #4277

Job	Run time
TEST (P6600, mipsisa64r6el-linux-gnuabi64, NO_SHARED=1 TARGET=P6600)	8m 42s
TEST (I6500, mipsisa64r6el-linux-gnuabi64, NO_SHARED=1 TARGET=I6500)	13m 22s
TEST (MIPS64_GENERIC, mips64el-linux-gnuabi64, NO_SHARED=1 TARGET=MIPS64_GENERIC)	8m 51s
TEST (I6400, mipsisa64r6el-linux-gnuabi64, NO_SHARED=1 TARGET=I6400)	13m 27s
TEST (SICORTEX, mips64el-linux-gnuabi64, NO_SHARED=1 TARGET=SICORTEX)	8m 9s
	52m 31s

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