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This patch fixes silliness where the SP pointer is continually
bumped up and down.
Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

Not all repos are necessarily branched.

While here, make the code a little bit more readable.

Run a CSE pass after vectorisation. This cleans up common sub-expressions introduced by the vectoriser. It has no effect unless -fvectorise is enabled.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

This makes the following statements valid C--, which uses the
block ID directly rather than generating an anonymous block:

    if (expr) goto foo;
    switch expr {
        case 0: goto foo;
        case 1: goto bar;
    }
Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

We were using the Typeable.hs macros, but for no good reason as
far as I can tell.

I also made the -ffloat-all-lams flag not take an argument, as it just
ignored it.

Makes it consistent with the existing "C compiler flags"
field.

Rather than using the compiler that configure detects, we use
the "GCC command" field from the --info output of the bootstrapping
compiler (provided it is >= 7.1).