Test creating ARM64EC importlib.

RUN: split-file %s %t.dir && cd %t.dir
RUN: llvm-lib -machine:arm64ec -def:test.def -out:test.lib

RUN: llvm-nm --print-armap test.lib | FileCheck -check-prefix=ARMAP %s

ARMAP:      Archive map
ARMAP-NEXT: __IMPORT_DESCRIPTOR_test in test.dll
ARMAP-NEXT: __NULL_IMPORT_DESCRIPTOR in test.dll
ARMAP-NEXT: test_NULL_THUNK_DATA in test.dll
ARMAP-EMPTY:
ARMAP-NEXT: Archive EC map
ARMAP-NEXT: #expname in test.dll
ARMAP-NEXT: #funcexp in test.dll
ARMAP-NEXT: #mangledfunc in test.dll
ARMAP-NEXT: ?test_cpp_func@@$$hYAHPEAX@Z in test.dll
ARMAP-NEXT: ?test_cpp_func@@YAHPEAX@Z in test.dll
ARMAP-NEXT: __IMPORT_DESCRIPTOR_test in test.dll
ARMAP-NEXT: __NULL_IMPORT_DESCRIPTOR in test.dll
ARMAP-NEXT: __imp_?test_cpp_func@@YAHPEAX@Z in test.dll
ARMAP-NEXT: __imp_aux_?test_cpp_func@@YAHPEAX@Z in test.dll
ARMAP-NEXT: __imp_aux_expname in test.dll
ARMAP-NEXT: __imp_aux_funcexp in test.dll
ARMAP-NEXT: __imp_aux_mangledfunc in test.dll
ARMAP-NEXT: __imp_dataexp in test.dll
ARMAP-NEXT: __imp_expname in test.dll
ARMAP-NEXT: __imp_funcexp in test.dll
ARMAP-NEXT: __imp_mangledfunc in test.dll
ARMAP-NEXT: expname in test.dll
ARMAP-NEXT: funcexp in test.dll
ARMAP-NEXT: mangledfunc in test.dll
ARMAP-NEXT: test_NULL_THUNK_DATA in test.dll

RUN: llvm-readobj test.lib | FileCheck -check-prefix=READOBJ %s

READOBJ:      File: test.lib(test.dll)
READOBJ-NEXT: Format: COFF-ARM64{{$}}
READOBJ-NEXT: Arch: aarch64
READOBJ-NEXT: AddressSize: 64bit
READOBJ-EMPTY:
READOBJ-NEXT: File: test.lib(test.dll)
READOBJ-NEXT: Format: COFF-ARM64{{$}}
READOBJ-NEXT: Arch: aarch64
READOBJ-NEXT: AddressSize: 64bit
READOBJ-EMPTY:
READOBJ-NEXT: File: test.lib(test.dll)
READOBJ-NEXT: Format: COFF-ARM64{{$}}
READOBJ-NEXT: Arch: aarch64
READOBJ-NEXT: AddressSize: 64bit
READOBJ-EMPTY:
READOBJ-NEXT: File: test.dll
READOBJ-NEXT: Format: COFF-import-file-ARM64EC
READOBJ-NEXT: Type: code
READOBJ-NEXT: Name type: export as
READOBJ-NEXT: Export name: funcexp
READOBJ-NEXT: Symbol: __imp_funcexp
READOBJ-NEXT: Symbol: funcexp
READOBJ-NEXT: Symbol: __imp_aux_funcexp
READOBJ-NEXT: Symbol: #funcexp
READOBJ-EMPTY:
READOBJ-NEXT: File: test.dll
READOBJ-NEXT: Format: COFF-import-file-ARM64EC
READOBJ-NEXT: Type: code
READOBJ-NEXT: Name type: export as
READOBJ-NEXT: Export name: mangledfunc
READOBJ-NEXT: Symbol: __imp_mangledfunc
READOBJ-NEXT: Symbol: mangledfunc
READOBJ-NEXT: Symbol: __imp_aux_mangledfunc
READOBJ-NEXT: Symbol: #mangledfunc
READOBJ-EMPTY:
READOBJ-NEXT: File: test.dll
READOBJ-NEXT: Format: COFF-import-file-ARM64EC
READOBJ-NEXT: Type: code
READOBJ-NEXT: Name type: export as
READOBJ-NEXT: Export name: ?test_cpp_func@@YAHPEAX@Z
READOBJ-NEXT: Symbol: __imp_?test_cpp_func@@YAHPEAX@Z
READOBJ-NEXT: Symbol: ?test_cpp_func@@YAHPEAX@Z
READOBJ-NEXT: Symbol: __imp_aux_?test_cpp_func@@YAHPEAX@Z
READOBJ-NEXT: Symbol: ?test_cpp_func@@$$hYAHPEAX@Z
READOBJ-EMPTY:
READOBJ-NEXT: File: test.dll
READOBJ-NEXT: Format: COFF-import-file-ARM64EC
READOBJ-NEXT: Type: code
READOBJ-NEXT: Name type: export as
READOBJ-NEXT: Export name: expname
READOBJ-NEXT: Symbol: __imp_expname
READOBJ-NEXT: Symbol: expname
READOBJ-NEXT: Symbol: __imp_aux_expname
READOBJ-NEXT: Symbol: #expname
READOBJ-EMPTY:
READOBJ-NEXT: File: test.dll
READOBJ-NEXT: Format: COFF-import-file-ARM64EC
READOBJ-NEXT: Type: data
READOBJ-NEXT: Name type: name
READOBJ-NEXT: Export name: dataexp
READOBJ-NEXT: Symbol: __imp_dataexp

Creating a new lib containing the existing lib:
RUN: llvm-lib -machine:arm64ec test.lib -out:test2.lib
RUN: llvm-nm --print-armap test2.lib | FileCheck -check-prefix=ARMAP %s

#--- test.def
LIBRARY test.dll
EXPORTS
    funcexp
    #mangledfunc
    ?test_cpp_func@@YAHPEAX@Z
    expname=impname
    dataexp DATA