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3ad762170b
No functional changes. Got myself bitten in r223113 when adding support for modified immediate syntax (regressions reported by joerg@britannica.bec.de, fixes in r223366 and r223381). Our assembler tests did not cover serveral different syntax variants. This patch expands the test coverage to check for the following cases: 1. Modified immediate operands may be expressed with expressions, as in #(4 * 2) instead of #8. 2. Modified immediate operands may be _optionally_ prefixed by a '#' symbol or a '$' symbol. 3. Certain instructions (e.g. ADD) support single input register variants; [ADD r0, #mod_imm] is same as [ADD r0, r0, #mod_imm]. 4. Certain instructions have aliases which convert plain immediates to modified immediates. For an example, [ADD r0, -10] is not valid because -10 (in two's complement) cannot be encoded as a modified immediate, but ARMInstrInfo.td defines an alias which can transform this into a [SUB r0, 10]. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223475 91177308-0d34-0410-b5e6-96231b3b80d8