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PowerPC uses a slightly different type of floats for their 128 bit long doubles, as "double-double", with __LDBL_MANT_DIG__ == 106 rather than __LDBL_MANT_DIG__ == 113 for IEEE 128 bit floats. This fixes compiling libcxxabi for PowerPC after 3b70715c13876c51542ebfe2e3f4ee908f6785cb.