Get codebase completely working with LLVM

You can now build Cosmopolitan with Clang:

    make -j8 MODE=llvm
    o/llvm/examples/hello.com

The assembler and linker code is now friendly to LLVM too.
So it's not needed to configure Clang to use binutils under
the hood. If you love LLVM then you can now use pure LLVM.

libc/tinymath/logbl.S

@@ -18,10 +18,10 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/macros.h"
 
-/	Returns log₂ₓ exponent part of long double.
-/
-/	@param	𝑥 is long double passed on stack
-/	@return	result in %st0
+//	Returns log₂ₓ exponent part of long double.
+//
+//	@param	𝑥 is long double passed on stack
+//	@return	result in %st0
 logbl:	push	%rbp
 	mov	%rsp,%rbp
 	.profilable