msvcp90: Added std::arg(complex) implementation.

dlls/msvcp90/math.c

@@ -1223,6 +1223,13 @@ complex_float* __thiscall complex_float_div_assign(complex_float *this, const co
     return complex_float_div(this, &tmp, r);
 }
 
+/* ??$arg@M@std@@YAMABV?$complex@M@0@@Z */
+/* ??$arg@M@std@@YAMAEBV?$complex@M@0@@Z */
+float __cdecl complex_float_arg(const complex_float *c)
+{
+    return atan2(c->imag, c->real);
+}
+
 /* ??0?$_Complex_base@NU_C_double_complex@@@std@@QAE@ABN0@Z */
 /* ??0?$_Complex_base@NU_C_double_complex@@@std@@QEAA@AEBN0@Z */
 /* ??0?$_Complex_base@OU_C_ldouble_complex@@@std@@QAE@ABO0@Z */
@@ -1622,3 +1629,12 @@ complex_double* __thiscall complex_double_div_assign(complex_double *this, const
     complex_double tmp = *this;
     return complex_double_div(this, &tmp, r);
 }
+
+/* ??$arg@N@std@@YANABV?$complex@N@0@@Z */
+/* ??$arg@N@std@@YANAEBV?$complex@N@0@@Z */
+/* ??$arg@O@std@@YAOABV?$complex@O@0@@Z */
+/* ??$arg@O@std@@YAOAEBV?$complex@O@0@@Z */
+double __cdecl complex_double_arg(const complex_double *c)
+{
+    return atan2(c->imag, c->real);
+}

dlls/msvcp90/msvcp90.spec

@@ -356,12 +356,12 @@
 @ stub -arch=win64 ??$abs@N@std@@YANAEBV?$complex@N@0@@Z
 @ stub -arch=win32 ??$abs@O@std@@YAOABV?$complex@O@0@@Z
 @ stub -arch=win64 ??$abs@O@std@@YAOAEBV?$complex@O@0@@Z
-@ stub -arch=win32 ??$arg@M@std@@YAMABV?$complex@M@0@@Z
-@ stub -arch=win64 ??$arg@M@std@@YAMAEBV?$complex@M@0@@Z
-@ stub -arch=win32 ??$arg@N@std@@YANABV?$complex@N@0@@Z
-@ stub -arch=win64 ??$arg@N@std@@YANAEBV?$complex@N@0@@Z
-@ stub -arch=win32 ??$arg@O@std@@YAOABV?$complex@O@0@@Z
-@ stub -arch=win64 ??$arg@O@std@@YAOAEBV?$complex@O@0@@Z
+@ cdecl -arch=win32 ??$arg@M@std@@YAMABV?$complex@M@0@@Z(ptr) complex_float_arg
+@ cdecl -arch=win64 ??$arg@M@std@@YAMAEBV?$complex@M@0@@Z(ptr) complex_float_arg
+@ cdecl -arch=win32 ??$arg@N@std@@YANABV?$complex@N@0@@Z(ptr) complex_double_arg
+@ cdecl -arch=win64 ??$arg@N@std@@YANAEBV?$complex@N@0@@Z(ptr) complex_double_arg
+@ cdecl -arch=win32 ??$arg@O@std@@YAOABV?$complex@O@0@@Z(ptr) complex_double_arg
+@ cdecl -arch=win64 ??$arg@O@std@@YAOAEBV?$complex@O@0@@Z(ptr) complex_double_arg
 @ stub -arch=win32 ??$conj@M@std@@YA?AV?$complex@M@0@ABV10@@Z
 @ stub -arch=win64 ??$conj@M@std@@YA?AV?$complex@M@0@AEBV10@@Z
 @ stub -arch=win32 ??$conj@N@std@@YA?AV?$complex@N@0@ABV10@@Z