[SYCL][NVPTX][AMDGCN] Move std::complex to headers (#19572)

This follows 4f0afd5 and moves
implementation of std::complex operations from libdevice to a header.

---------

Co-authored-by: Marcos Maronas <[email protected]>

Author: bader

libdevice/complex_wrapper.cpp

@@ -8,8 +8,7 @@
 
 #include "device_complex.h"
 
-#if defined(__SPIR__) || defined(__SPIRV__) || defined(__NVPTX__) ||           \
-    defined(__AMDGCN__)
+#if defined(__SPIR__) || defined(__SPIRV__)
 
 DEVICE_EXTERN_C_INLINE
 float cimagf(float __complex__ z) { return __devicelib_cimagf(z); }

libdevice/complex_wrapper_fp64.cpp

@@ -9,8 +9,7 @@
 
 #include "device_complex.h"
 
-#if defined(__SPIR__) || defined(__SPIRV__) || defined(__NVPTX__) ||           \
-    defined(__AMDGCN__)
+#if defined(__SPIR__) || defined(__SPIRV__)
 
 DEVICE_EXTERN_C_INLINE
 double cimag(double __complex__ z) { return __devicelib_cimag(z); }

libdevice/device_complex.h

@@ -10,8 +10,7 @@
 
 #include "device.h"
 
-#if defined(__SPIR__) || defined(__SPIRV__) || defined(__NVPTX__) ||           \
-    defined(__AMDGCN__)
+#if defined(__SPIR__) || defined(__SPIRV__)
 
 // TODO: This needs to be more robust.
 // clang doesn't recognize the c11 CMPLX macro, but it does have

libdevice/fallback-complex-fp64.cpp

@@ -9,8 +9,7 @@
 
 #include "device_complex.h"
 
-#if defined(__SPIR__) || defined(__SPIRV__) || defined(__NVPTX__) ||           \
-    defined(__AMDGCN__)
+#if defined(__SPIR__) || defined(__SPIRV__)
 #include <cmath>
 
 // To support fallback device libraries on-demand loading, please update the

libdevice/fallback-complex.cpp

@@ -8,8 +8,7 @@
 
 #include "device_complex.h"
 
-#if defined(__SPIR__) || defined(__SPIRV__) || defined(__NVPTX__) ||           \
-    defined(__AMDGCN__)
+#if defined(__SPIR__) || defined(__SPIRV__)
 #include <cmath>
 
 // To support fallback device libraries on-demand loading, please update the