compiler: stop using long-calls on hexagon

No longer necessary since LLD supports thunks and we use -ffunction-sections.

src/Compilation.zig

@@ -6691,10 +6691,6 @@ pub fn addCCArgs(
 
     // Non-preprocessed assembly files don't support these flags.
     if (ext != .assembly) {
-        if (target.cpu.arch == .hexagon) {
-            try argv.append("-mlong-calls");
-        }
-
         if (target_util.clangSupportsNoImplicitFloatArg(target) and target.abi.float() == .soft) {
             try argv.append("-mno-implicit-float");
         }

src/Module.zig

@@ -391,7 +391,6 @@ pub fn create(arena: Allocator, options: CreateOptions) !*Module {
         try buf.appendSlice(disabled_features.items);
 
         if (target.cpu.arch == .hexagon) {
-            try buf.appendSlice("+long-calls,");
             try buf.appendSlice("-small-data,"); // Unsupported by LLD.
         }
 

test/tests.zig

@@ -420,7 +420,6 @@ const module_test_targets = blk: {
             .link_libc = true,
         },
 
-        // Similar to Thumb, we need long calls on Hexagon due to relocation range issues.
         .{
             .target = .{
                 .cpu_arch = .hexagon,