fix: detect Arm NEON with alternative predefined macro

Currently Arm NEON availability is detected using only the __ARM_NEON__
predefined macro. However this is not used by all modern compilers,
it seems it was superseded by __ARM_NEON. The "Arm C Language Extensions"
guide[1] refers to __ARM_NEON macro aswell.

To be able to detect NEON availability more reliably, check for
both macro names.

[1]: https://developer.arm.com/documentation/ihi0053/d/ - pdf, section 6.9

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>

Author: OldManYellsAtCloud

src/implementation/c/index.ts

@@ -49,7 +49,7 @@ export class CCompiler {
     out.push('#endif  /* __SSE4_2__ */');
     out.push('');
 
-    out.push('#ifdef __ARM_NEON__');
+    out.push('#if defined(__ARM_NEON__) || defined(__ARM_NEON)');
     out.push(' #include <arm_neon.h>');
     out.push('#endif  /* __ARM_NEON__ */');
     out.push('');

src/implementation/c/node/table-lookup.ts

@@ -202,7 +202,7 @@ export class TableLookup extends Node<frontend.node.TableLookup> {
       return false;
     }
 
-    out.push('#ifdef __ARM_NEON__');
+    out.push('#if defined(__ARM_NEON__) || defined(__ARM_NEON)');
     out.push(`while (${ctx.endPosArg()} - ${ctx.posArg()} >= 16) {`);
     out.push('  uint8x16_t input;');
     out.push('  uint8x16_t single;');