Got rid of explicit padding in t_expression_value

By declaring the member variables as int64 rather than int8[8], padding happens
automatically.  int64 is also a more convenient type to work with in most
places.

Signed-off-by: Morten Hustveit <morten.hustveit@gmail.com>
llvm-vm.cc: Initialize a variable to silence compiler

This variable could not be used uninitialized in the first places, but the
compiler couldn't tell.

Signed-off-by: Morten Hustveit <morten.hustveit@gmail.com>
llvm-expression.cc: Support CA_TIME_FLOAT4 fields

These fields are simply passed as pointers and lengths.

Signed-off-by: Morten Hustveit <morten.hustveit@gmail.com>
.gitignore: Ignore *.plist files from the clang static analyzer

Signed-off-by: Morten Hustveit <morten.hustveit@gmail.com>