Double support#4

Draft

pjaaskel wants to merge 16 commits intocpc:masterfrom

rhinton:doubles-rwh

Commits on Dec 17, 2015

Commits on Dec 18, 2015

added mkdir commands to create non-existent TARGET_DIR
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added executable bit to test file
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updating 64-bit value alignment to 64b to match machine definition (tce/src/applibs/LLVMBackend/TCETargetMachine.cc)
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fixed inline assembly register selection per excellent tracking down by pjaaskel, now I can compile _TCE_ABSD macro
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improved approximately equal checking to use hybrid relative/absolute checking, restored calls to fabs
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temporary changes to doubles.cc test source to hopefully narrow down the CompileError exception
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added patterns to ignore test results
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fixed merge conflicts
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Commits on Dec 19, 2015

fixed lwpr include, wrapped in extern C
rhinton
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Commits on Mar 26, 2017

merge from upstream main, TCE release 1.15
rhinton
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