* Remove frobbing of the FPU modes from alloc and dealloc.
 * Use 16-byte alignment for all platforms. It's harmless for those
   that don't require it.

call-out.

 * lisp/x86-assem.S
   * Rip out all of cruft dealing with float return values and the
     need for maintaining the FPU state.  Just call the foreign
     function and return, letting call-out deal with the result.
 * compiler/x86/sse2-c-call.lisp
   * Handle the different return values depending on whether we
     declared the function to return a float or not.

For sse2, we don't need to do the fldz/fstp dance when doing a
foreign function call.

A cross-compile is needed!

 * src/bootfiles/20e/boot-2014-04-cross-x86.lisp:
   * Cross-compile script to enable these changes.
 * src/compiler/x86/c-call.lisp:
   * Make the float result tn be xmm registers, not x87 fpu registers.
 * src/compiler/x86/sse2-c-call.lisp:
   * Simplify call-out not to use fldz/fstp except for the minimum
     required for the 32-bit ABI.
 * src/lisp/x86-assem.S
   * Comment out the fstp/fldz insts that aren't needed for SSE2.

 * Command-line options allowing building for x87 are gone. 
 * Don't try to install x86f fasls.

install it first.

test files.

PCL-TESTS to match how our test-runner wants to name packages.

returned something like #c(-715 pi) and -715.

 * src/code/irrat-dd.lisp:
   * Handle -0w0 and 0w0 specially in dd-%log.

 * tests/trac.lisp:
   * Add a test for this in trac.lisp.

double-double-float-negative-infinity.

It's incorrect. We really want log(-0) to be -inf + i*pi. It's needed
to get the correct values on the branch cuts of the special functions
from the definitions.  

Update trac test to test for this.

 * Round the number to least-positive-foo-float when possible, but
   still throw an error if it's too small but not zero.
 * Update comments to mention CLHS 2.3.1.1.

 * Add least-positive-normalized-double-double-float,
   least-negative-normalized-double-double-float,
   least-positive-double-double-float,
   least-negative-double-double-float,
   most-positive-double-double-float,
   most-negative-double-double-float to the extensions package.

 * src/code/reader.lisp:
   * Try to round really small numbers
   * Add somewhat more informative message when the number is not
     representable.
 * src/i18n/local/cmucl.pot:
   * Update
 * tests/trac.lisp:
   * Add test for ticket 93
   * Add a few comments for test trac.87.